Engineering Calculators & Converter Applet & Spreadsheet Resources

Espresso Engineering Workbook™ for Excel

The newest release of RF Cafe's spreadsheet (Excel) based engineering and science calculator is now available - Espresso Engineering Workbook™. Among other additions, it now has a Butterworth Bandpass Calculator, and a Highpass Filter Calculator that does not just gain, but also phase and group delay! Since 2002, the original Calculator Workbook has been available as a free download. Continuing the tradition, RF Cafe Espresso Engineering Workbook™ is also provided at no cost, compliments of my generous sponsors. The original calculators are included, but with a vastly expanded and improved user interface. Error-trapped user input cells help prevent entry of invalid values. An extensive use of Visual Basic for Applications (VBA) functions now do most of the heavy lifting with calculations, and facilitates a wide user-selectable choice of units for voltage, frequency, speed, temperature, power, wavelength, weight, etc. In fact, a full page of units conversion calculators is included. A particularly handy feature is the ability to specify the the number of significant digits to display. Drop-down menus are provided for convenience...

Engineering Calculators & Converter Applet & Spreadsheet Websites - RF Cafe

These calculators are offered free of charge - some by vendors and others by individuals. Some are stand-alone and others function online via Java from the web page. The majority are engineering calculators, but some are scientific calculators, some are amateur radio calculators, and some are electrician type calculators.

Unit Conversion Tool - powerful, intuitive, and easy-to-use utility for quick and accurate conversion between almost every possible unit of measure, from one system to another. The latest version includes more than 2200 units in 78 categories. The categories include: length, area, speed, mass, numbers, volume, time, density, force, pressure, energy, power, flow, temperature, angle, light, fractions, data transfer, and many more. Fully functional Online version now available.

This is a nice assortment (83 at this time) of electrical & electronics parameter calculators, with a couple mechanical types as well. There are many types of substrate impedance and line dimension calculators, and calculators for voltage dividers, inductance and capacitance, coax lines and waveguides, amplifiers, impedance matching, free space loss, EIRP, radar range, and noise figure.

A very nice graphical interface tools that enables you to compare manufacturers, while taking into account the terrain of your area, terrain type, climate, antenna type, define fade margin and more. Use of a GPS database produces a very accurate elevation profile between antenna locations.

This has to be one of the Web's largest collection of unique (as opposed to copied) online calculators. Each of these topics has many calculators within them. General, Civil Engineering, Optical Engineering, Mechanical Engineering, Plastics Engineering, Metallurgy, Electronics Engineering, Electrical Engineering, Chemical Engineering, Physics, Ceramics, Oil & Gas, Structural Engineering.

Large selection of online interactive calculators for RF design, including attenuators, capacitance, resonance, RF traps, and microstrip impedance. Design, development and small scale manufacture of simple RF and Audio items. We also have the capability for ATE programming in Labview, HP/Agilent Vee or Visual Basic, and can produce associated test jigs.

Calculators for switching power supply, air core inductors, Sallen-Key LP Butterworth filter, L matching network, standard resistor value, PI & T pad attenuator, reactance, series - parallel impedance conversion, Z-S-Y parameter conversion, Rollet Stability (K) Factor, complete RF amplifier design & analysis, LC resonance.

Calculates the real and imaginary parts of the dielectric constant for water, sung temperature, salinity, and frequency. By Gareth Harris

Advanced features including support for complex numbers, unit conversion, base conversion, and has a built in equation solver. eCalc is one of the best calculators on the web and runs completely in your browser without requiring any special plugins. Electrical engineers will find eCalc's complex math especially useful since it supports both rectangular and polar formats. eCalc supports both RPN and Algebraic Input Modes.

Do an FFT by entering the time domain data in the Time Domain Data box with each sample on a new line. For complex (I and Q) data, the real and imaginary components should be on the same line separated by a comma. Do an Inverse FFT by entering the frequency domain data in the Frequency Domain Data box with each sample on a new line. For complex (I and Q) data, the real and imaginary components should be on the same line separated by a comma.

Plots FCC 60 dBu contours right on the page. Also many PDF files with Engineering Tables: Geotechnical Investigations for Antenna Support Structures, Classes of FM Stations, FM Broadcast Channels, AM Tower Heights by Frequency, 54 dBu Contour Distances, 60 dBu Contour Distances, Site Plot Plan, Wind Speed Map, Ice Probability Map, Antenna Support Structure Design Radius of Curvature Requirement.

Sennheiser searches the FCC database for an open channel for running interference-free wireless systems.

Huge collection of online calculators for tax, finance, math, engineering, mortgages, logistics, loans, budgets, conversions, sports & health, statistics, mechanics, and other topics.

Large variety of financial calculators for mortgages, principal calculation, cost per thousand, affordability, income requirements, FHA, refinance, HELOC, loan comparison tools, points, rent vs buy, & more.

8 different calculators: Mortgage calculator, Affordability, Early Pay-Off, Interest Only, Advanced Mortgage calculator, Mortgage Refinance, Basic Amortization, and Comparison calculator

Electronic circuit design calculators can assist you to solve, analyze and determine the circuit design with capacitors, inductors, resistors, diodes, transistors, etc. Many other types of financial, mathematical, and science calculators.

A very complete set of online calculators for microstrip, embedded, and differential microstrip impedance; stripline and differential stripline impedance; stripline and microstrip crosstalk; current-carrying capacity of traces and thermal vias; heat dissipation of thermal vias. By Sören Nilsson.

The intention of this site is to produce scientific tools and calculators, and store information which will be useful to scientists, engineers, students and enthusiasts.

This resistor color code calculator also provides a table of nearest standard values of resistors for standard tolerances.

Collection of commonly used calculators including Attenuators, Bandpass Filters, Cascaded Components, Coils / Inductors, Delta-Wye (Resistors), Directional Couplers, Doppler Shift, Highpass Filters, Lowpass Filters, Mixer Frequency Conversion, Near / Far Field, Noise Figure|Temp, Path Loss, 1-Way, Path Loss, 2-Way, Propagation Time, Radar Blind Speed, Radar Horizon / Line of Sight, Rectangular Cavity, Skin Depth, Smith Chart, VSWR|RL|Gamma, Voltage Divider, Voltages & Power - Vrms, Vavg, Vpk

Many online calculators for noise figure/temperature, filter responses, voltage dividers, waveguide cutoff frequency, VSWR-return loss-reflection coefficient conversions and more, by Kirt Blattenberger.

This is a VERY nice collection of Java applets and some PDF format tutorials. Antenna patterns, waveguide modes, electromagnetic wave fronts, interactive Smith chart, transmission lines, standing waves, resonant circuits, radiation of wires, cross-talk, much more. By Amanogawa.

Kelly Painter's RPN calculator - click for full-size image

This handy Reverse Polish Notation calculator was written by the infamous Kelly Painter. Note the logo in the upper right corner (hover your cursor over it).

Transmission Line Calculator by Applied Wave Research. This file seems to be no longer available on the AWR website.

If these to converters don't have it, you don't need to convert it! by 1728 Software.

This is a very extensive measurement value and units converter for length, weight, height, area, temperature, time, pressure, speed, force, etc. Each and every converter has a detailed explanation with an example.

RF & microwave design applets that use numerical input or sliders for setting parameters.

Many calculators for wireless link planning: Fresnel zone, diffraction, path loss, link budget, cable loss.

Engineering Calculators & Converter Applets & Spreadsheets